Error correction and detection method of S mode ADS_B system

Abstract

The invention discloses an error correction and detection method of an S mode ADS_B system. The error correction and detection method comprises the following steps of initializing parameters of the S mode ADS_B system, computing reference power value, extracting a received ADS_B information bit and analyzing confidence coefficient, and correcting and detecting errors of the S mode ADS_B system. The error correction and detection method has the advantages that according to the characteristics of ADS_B information data received by the ADS_B, a low confidence coefficient bit is regarded as a root of an ADS_B information error code through judging 'high' and 'low' confidence coefficient of each bit; on the basis that only five error bits can be corrected according to the existing method, a data stream is obtained through utilizing multiple XOR operations of error correction and CRC check codes, and is compared with a 24 bit data stream starting from a first low confidence coefficient bit, so that an error code larger than 5 bits but meeting a certain condition is further corrected; and according to the method adopted by the invention, the ADS_B information data which can be corrected is prevented from being lost, and the error correction and detection capacity of the S mode ADS_B system is improved.

Description

technical field [0001] The invention relates to an air traffic control signal processing method, in particular to an error correction and detection method for an S mode ADS_B system. Background technique [0002] With the rapid development of my country's economy, China's civil aviation transportation industry is also growing rapidly, and the relevant departments of China's civil aviation have decided to open the airspace within 3000 meters in the next few years, so that more and more general-purpose aircraft will enter the airspace. The rapid development of the air transport market has brought about congestion at airports and air routes, and problems such as runway intrusion, scene conflicts, and aviation safety have become increasingly prominent. ADS_B is also a new type of system that has flourished under this background. [0003] ADS_B is the English abbreviation of Automatic Dependent Surveillance-Broadcast. It mainly implements air-to-air surveillance. The aircraft eq...

AI Technical Summary

Problems solved by technology

However, when the number of error bits is greater than 5, the method considers that the ADS_B message data has too many errors, and the error correction and detection operation of the error code cannot be realized, which makes the error correction and detection capability of the S-mode ADS_B system lower

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